CI/CD Interview Questions and Answers
Real scenario-based questions, a free 12-page CI/CD guide, and practice exercises — tool-agnostic, free to get started.
Free CI/CD interview questions
A free sample — one beginner, one intermediate, one advanced — with the full answer shown below each question.
BeginnerWhat's the difference between continuous delivery and continuous deployment?
Continuous delivery means every change that passes the pipeline is ready to deploy, but a human still approves the release. Continuous deployment goes further — every passing change deploys to production automatically, no manual gate.
AdvancedYour CI provider has an outage, blocking all automated deploys. What manual fallback process should exist for a true emergency?
A documented, rarely-used manual deployment runbook — exact commands or a break-glass script that can push a known-good build directly, bypassing the CI platform — tested occasionally so it's not the first time anyone's tried it during an actual emergency, when it matters most.
IntermediateWhat's the purpose of a "dry run" flag on a deployment tool integrated into CI?
It shows exactly what the tool would do (which resources would change, which version would deploy) without actually making the change — letting you review a pipeline's intended action before committing to it, similar in spirit to reviewing a `terraform plan` before an `apply`.
Learn CI/CD in depth, free to start
A 12-page guide covering why CI/CD exists, reading a real pipeline run, deployment strategies, rollback and release management, and DORA metrics — not tied to one specific tool. The first page is free for everyone.
- Getting Started: Why CI/CD Exists
- Branching Strategies & Trigger Models
- Reading a Pipeline Run: Logs, Stages & Failures
- Pipeline Fundamentals
- Build & Artifact Management
- Testing Strategies in CI
Practice CI/CD for real, tool-agnostic
Fix a rolling update that allows every Pod down at once, promote a tested image to production by digest instead of a risky rebuild, or bisect a nightly build to find the exact commit that broke it — all graded on real pipeline behavior.
Try the CI/CD practice exercises →CI/CD interview FAQ
What are the most commonly asked CI/CD interview questions?
Interviewers usually describe a pipeline problem — a flaky test that only fails under load, a rollback that broke because the old code still reads a dropped column, a deploy job with a leaked credential — and ask how you'd fix the real cause, not just restart the build.
Do I need to know a specific CI/CD tool, or just the concepts?
The concepts transfer everywhere — rollback strategy, secrets handling, deployment strategies, pipeline-as-code — so most interviews probe those first. Knowing one real tool well (Jenkins or GitHub Actions, most commonly) is enough to show you can apply the concepts, even if the job uses a different one.
What's the difference between continuous delivery and continuous deployment?
Continuous delivery means every change is automatically built, tested, and made ready to release — a human still approves the actual release. Continuous deployment goes one step further and releases automatically with no manual gate, as long as the pipeline passes.
How do I practice CI/CD without a real pipeline?
Work through fix-the-workflow exercises and simulated-terminal incidents first — fixing a rolling update with no surge capacity, promoting a tested image by digest instead of rebuilding, reading the four real DORA delivery metrics — all graded on real pipeline behavior.
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